The move comes after 94% of members of the Irish Air Line Pilots Association (Ialpa) voted in favour of industrial action earlier this month.
Ialpa served strike notice on the low-cost carrier on Wednesday (14 August), adding pilots would reveal more action in due course.
UK-based Ryanair pilots are also striking over pay and conditions.
The British Airline Pilots Association (Balpa) announced two walkouts, one from 22-23 August, while the second strike will be held from 2-4 September.
Forsa, the parent union of Ialpa, which represents 180 Dublin-based pilots who are directly employed by Ryanair, is seeking changes to pay levels and structures for its pilots, which it says will bring them “in line with sector norms”.
Ryanair has called on pilots and Forsa to return to independent mediation.
Eddie Wilson, Ryanair chief people officer, said: “We have done everything in our power to avoid disruption to our flights and our customers’ holidays.
“However, no company can concede to grossly unreasonable demands from its highest paid workers.”
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